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Inside a bunker at Launch Pad 39B, the STS-103 crew are instructed about use of the equipment. From left (in their astronaut uniforms) are Mission Specialist C. Michael Foale (Ph.D.), Commander Curtis L. Brown Jr., Mission Specialists Claude Nicollier of Switzerland, Steven L. Smith, John M. Grunsfeld (Ph.D.), and Pilot Steven J. Kelly. Not shown in the photo is Mission Specialist Jean-Frangois Clervoy of France. Nicollier and Clervoy are both with the European Space Agency. As a preparation for launch, the crew have been participating in Terminal Countdown Demonstration Test (TCDT) activities at KSC. The TCDT provides the crew with emergency egress training, opportunities to inspect their mission payloads in the orbiter's payload bay, and simulated countdown exercises. STS-103 is a "call-up" mission due to the need to replace and repair portions of the Hubble Space Telescope, including the gyroscopes that allow the telescope to point at stars, galaxies and planets. The STS-103 crew will be replacing a Fine Guidance Sensor, an older computer with a new enhanced model, an older data tape recorder with a solid-state digital recorder, a failed spare transmitter with a new one, and degraded insulation on the telescope with new thermal insulation. The crew will also install a Battery Voltage/Temperature Improvement Kit to protect the spacecraft batteries from overcharging and overheating when the telescope goes into a safe mode. Four EVA's are planned to make the necessary repairs and replacements on the telescope. The mission is targeted for launch Dec. 6 at 2:37 a.m. EST.